Grinding-mill.



I. W. COVER.

GRINDING MILL.

APPUcATxoN man ocr. 2a, |916.

Patented out. 9. 1917.'

3 SHEETS'YSHEET 2.

l. W. COVER.

GRINING MUL- APPUCATIUN msn GCT. 28. uns.

Patented Oct. 9, 1917.

3 SHEETS-'SHEZT 3.

JOHN W. COVER,- OF TACOMA, WASHINGTON.

GmNDING-MILL.

Speoicatlon ot Letters Patent.

Patented Oct. 9, 1917.

i Application led Uotoher 28, 1916. Serial-N0. 128.337.

To all 'wiwi/i t may concern Be it known tliiitl, Jouw. W'LCoifisu, it citz'en of the United States. und uesident of the city of Tiiconui,- county of Pierce, und Stateof Wnshin on, have invented cci-ruin new and useful improvements in Grinding L Iills, of-whch the following is c spi-ritiention.

My invention rolutes to grinding mills und particularly to mills intended for grinding or pulveizing os midis of the type which are commonly .referred to us bur or tubemillsfn which` the grindiiiv @Heel is duc tn the rolling of u masc.' of oosihairs upon themselves, with the innturiul to he ground mixed therewith.

The object of my invention is to provide n mill of this character [which shrill hv siniA pleandchcnp in construction, in whichtho parts whichnro .most liublc tqweur ure so constructed that thoy ma y he, oasily i'cplncrd :md which shall lixivc lilith-a hii'gc grinding and u lurgo screening :,jiipiicity.

My invention consists offthc noi-dl fru- Vand then pnrticnlzirly pointed out iu the screen frame.

claims. l

In the 'accompanying .drawings l lnive show-n ii millcontructed'iin nccordiincrY with rzrvinvrntioii, the samobcingriu its dciuils dfconstruction und iii thc .i n'lcniunt of its ports, of the cliuriicttrr which is nt thc present time prefcrredhy nie.

Figu

rt. 1 is i1 tiniisvcrsci soctioiuil clorutionA of 4the mill.

Fig. 2 vis ii longitudinal soctioiinl olcriitimi of the mill. i

` Fig. 3 is aii'outoi' 'fucivivw 'of one of tho screen frames; i

Fig. di is n. triinsv-rsosuction through ii Fig. 5 iS a. screen fumo showing. the outcr func.f

Fig. tisui. section wholly-,through micoiid bar ofthe-screen Showing it relation to tho hellof t-lie"mill.

In constructing my niiltl provide u shell l, which is prcfiiriilily 4of Vc vhndrmul .chopinv and provide thopcriphcry nl Ythis shcll with dctiiil viiiw of ono. oornur of in.l

from is u. plurailiiy o'l' rings 2, which, rings form u support for thu hair cnntnctingnicmhers 20. said niunihi-rri 20 living Iii-rein shown iis composed of srgmuntnlphiirs liolludtu thu i'inlgV 2. 1 lpivcuhnirii fhosi sogniontiil iwiii' p ilboi iis proi'iili'd willi projections 2l .at each ond, which ncl, to :i ci-rlaiiii extent.

to curry upwurd thi.I l:grinding lnii's n4 tho: cylirridcr is rovoli'cil. t u-.sc wriir phitrs 2U homiidil of ii Iiziril rrsistant inuteriiil so that they will not ho qnickly'ii'orn olii h i' tho iiclioii ol' tho mill.

I lini'c shown two rings 2 un iiistiillod within thi' cylinder. This niinilior, it is lio lievi-.ih will bi, found .fiinplo for mills of Intdiuiii silo. although thtl nunilii-iA nini' lio incl-raised. il' thenl he any rruson for iloinf?r so. v

1`ho rings- 2 im'` provided, upon their miur Surfin-os, with projections .L,..foriiiiiig logs lo spncc the rings iiiwui'd from tho sholl l. 'Phono logs l. ,()iidinuniioi' of duinglhis is hy providing pziss. Thies construction lrnvr ii Sorlin; gl-

lt is intciidoil lhiitv opi-iiiiigs b utwouii tho shull und' tho ring..

lmiiiivdvd iitvthi'ir cni'lsliy thi` logs :22. This proi'ido'frro circulation oftliu liner niiito- -riii'l-contained in the (gvliiidri' throughout thv length of this cylinilrr` and tho rings do not.; rediigx lllii' ici'ocnilig iiiy'iu.

The, shellhus sccircd thereto ii siriigs iiiigliphitcs 11`, which-project uwiird. hut stop short 'nl'4 thc inner-.inca nl ,thc rings 2. Thi-Ho thingifs forni iiint'uiiiil vlot-iitiiigsholi'os which, :is ihr. inill rcvolirs. oui'ry tho muli-.- rial up und i-linclizirgc it 'upon the pile of rods lic-ing .round in croissectiorn-.ulthoiigh thi-,y

muyv hc iiiiide ofany croi-.s suction which iis i. found --lo work 4siitnifiictorily, Thus-c nids cxtciiil sl'ihstiintnilly from 'houd to hond it i,

thc cylindcr, lining Hul'ii-:iciitly shorter thun this distance to iiiiiko it iriipossihli` For thon to hccoiriu wcdgcd hetwc-n oppositchculs.

Thu typo of sci-ecn which I prcfor to clin,

' friiiiio consistii .40. to which tic, other ps irts nro secured.

Tho end liiirsftlnw prefcriihly cut iiw'ii y inv closely 'fucos'of drum 1'. This leaves ii iingc lscc- -tion 4,1', which at one cnd'projccts through the opening into the drum -chiiinlier und nt ici-imno its oliicr ein] runs out to nothin;r :is is shown iii Fig. 4, u'liL-irin flic ciiii'eil ilottvil liuc represents the extent of tho ciit-iiii'iiy portion. The thickness ol' this Hiingc is shown in Fig. 6.

Cross bars 4Q, nixA liliicid nt siii-li intervals us nifty lic Llcsiicd ci' necessary. The inner surfaces of these cross liiirs' nrc iii tlic sinne plone :is the iuiicr surface of the ond bars lo 40. Upon the innoil sui-facts; of those biiis and the flanges 41 of end bai-s 40 und ono of the side lmi's 4, is secured :i rclativcly coarse screen 43. This sci-ecn, nt one side of thv fi'iuiic, is spiiccd inward from thc bur -l of thc friiine :ind also 'inirni'd fioiii the shell of the ili'uiii 1, thus leaving nii opening 44 of such size thiit :my particles which pass throufifli the screen 43 liiit. uro too large to pass through the outer screen 45, will be discharged therefrom when this side of clic4 screen is down.

Upon the outer surfiicc'of thc sciccn -frnmo n line screen 4 5 is secured. This scicniis of whatever finciicss it is desired thc material shall be ground before discharge and whatcvci' material passes through this screen is discharged from thc mill. Anytliin r too coarse to go through this screen wou d be' ed fromrlic opening 44 hack into 3g the mil chambcna'nd be regroiirid. The mimncr ofy securing the outer or fine disch screen to the Vscri'zc'n frame, which I- have herein shown und which I now prefer to ilse, icas yfollows. The outer fnccsof the bnrs i g5 und 40 oro providod with groves 46, extendinglcngthwiscthei'eof, into 4which a screen` is fonce'cl'b means of stfrips- 47, 'which-nrc :Iorcedinp ce-b moimsof o. metal frame.

c oecd of img c bnr sections l5. The anflga'r for one of thcsoframes consists of` tivo pieces, ono ofthe lliinges boing clipped so as to permitb'cnding at thefcorner, mnd

th other mge which enga es with the odge siiifocos of tho ,frame inem rs, is projected 4; outv'i'nrd to form cars 50 which arcjnined si by a bolt, 151.V In addition', the. arilo iron fnme may bcccured by screws ,5o. The screens are secured in luce on thcdriigns lo` any suitable mclane.' 'havcshow l5 so as cx't'endir'ig aci-oss the scroendnin1nd provided with openings, lwhich for conven- Axciiico'inay he madc as slots M in Vtli'cgcniic elevating angcs, su

l and yet will have a considerab rings 9. iserve not onli,r iis the support for the wrm' plates upon which the grincli bars 3 nist, but iilso ns stifle/ning ribs for the drum.

The drinn is provided with o. neck 12 at euch cnil, which noch has n liangc 13 at its 70 oiitvr end, to which is secured a wheel tread 14, und this wheel tread turns uponwheels 15 which are mounted on fixed frame work; `This lciivcs n central or -axinl opening at oai-li and of the drum, throu h which mte- 'la riil muy bc inserted und by w ich access may lic hail into the interior of the drum when ilisired.

Movement muy be. imparted to the drum h r guur wliccl, or sprocket wheel, or any otlior suitable manner. I have shown one of the necks 12 provided with a Hangs 16 to which is secured a rin'i section 1 of o sprocket wheel. f

By roriding ii tank or tub 7 of suitlble 35 size, t ie lou-cr portion of the drinn, includin the part wherein thc grinding action is tu :ing plucc, may be immersed in water and the mill thus run as n wet mill. If desired, tlio water maybe dispensed with and dry o0 'grinding done.

Through the nxal openings existing at theends of the mill, a tube or feed chute 8 muy be inserted. This maybe provided with discharge opcnin and the material to 95 bc ground may c fed through this tube. The fced'of the material into und through 'this muy be secured by. any of the woll known methods of advancing granular or vdri7 material throirh c tubo. Secund to 100 this tubo and exten in .upward at an anglo 'atatlie upper. portion o the drum 'is a. indoctin plate 81, which will catch any mlterial w ich has heen carried well towaird the top of the drum and deect it bool: ii on the upper portion of the pile of grin in rods'.

.By su portnsthc rings' whic incloso the grin ng r 3, -ii n le which are spnced'inwirdly'from l: o shel of thodnim,

a considerable space is rovidcd for the h scc tion ofthe mntericl in ground., Also,

'i this nickels it blc tout' 'zo a ll'rgcpcroft e' surface 'of'thedru'mdor aci-ccnl. Y VIt also maken tpclaiblo to provide ce; n nin inn.,

"hli mi i d??? lili "m'" nl. u an c upon. grin i bara'. ghe' devicl: ,thus constitutes an eioio'nt grinding mill of largo capacity having cle-i,V f

rating mechanism and scrccmil devices, Il )tu in :im le and compact-form'. c power rai.,

to turn it is not portioularly groot. e mill need noche nudo of ve large site capacity.' It is evident that if additional screening covis goity is desired, the number of screens may increased over that herein shown. The particular construction of screens einloycd prevents thc greet bulk of msterial 'mg ground from contacting nththe scp 130 arating or outer screens. The coarse inner' screens make a preliminary separation, passing nothing hut the liner material to the outer screen and not too coarse to pass through the fine screen, are immediately rcturned and deposited upon the grinding liars to be further ground.-

Vhat I claim as my invention is:

l. In a grinding mill, in combination, a revolubly mounted drum having screens placed in the peripheral portions thereof, a plurality of coaxial, axially-spaced rings within said shell and spaced inward therefrom, and grinding bodies loosely supported within said rings.

2. ln a grinding mill, in combination, a revolubly mounted drum having screens placed in the peripheral portions thereof, a plurality of coaxial, axially-spaced rings within said shell and spaced inward therefrom at lall points, material elevating flanges projecting inward from the outer shell, andgrinding bodies loosely support- -cd within said rings.

l. ln a grinding mill in Combination, a revoiubly mounted drum, material. elevating llanges projecting inwardlyr from the peripheral shell of the drum, a plurality ol liar-supporting runways coaxial with and spared inward Jfrom the peripheral shell and grinding bars loosely retained within said runways.

L ln a grinding mill inconibination, a revolubly mounted drum, material elevating flanges projecting inwardly from the peripheral shell of the drum, a plurality ol? bar-supporting runways coaxial` with and spaced inward from thel penpheral shell, grinding bars loosely retained'within said runways, and screens on the periphery of the drum for removing the material fas pulrerized.

5. In a grinding mill, in combination, a

revolubly mounteddrum, a series of grinding bars extendin'g lengthwise the drinn and widely separated rings, said rings having their inner surfaces concentric with and ,spaced innardly from the shell of the drum and serving as supporting runways for the grinding bars.

il. In a grinding mill, in combination, a revolubly mounted drum, grinding bars loose within saiddruni, trackways for said bars spaced inward from the shellof the drum, material elevating vanos extending from the shell of the drum inwardly and a detlecting plate within the drum and extending over the centralzone thereof to direct the material deposited thereon back upon the grinding bars.

T. In a grindingmill, in combination, a revolubly mounted drinn, grinding bars loose within said drum, trackways for said bars spaced inward from the shell of the drunnniatcrial elevating devices carried by thelshell of the drum, fixed feed conduit ad- 'jacent the axis 4of the dru and a dellecting plate supported within t iefdrum in transversely inclined position above said feed conduit and adapted to doliect back upon the grinding bars material deposited thereon by the material elevating means.

8. ln a grinding mill, in combination, a

revolubly mounted drum, a series of grind-' ing bars extending lengthwise the drum and a plurality of widely separated traclrway rings enlfending'` peripherally within and turning with the drum', the inner surfaces of said rings constituting ymoans for supporting the grinding bars inward from the shell/of `the drum, and screens located in the peripheral shell of the drum.

Signed at Seattle, Washington, this 23rd day of October, 1916.

JOHN W. COVER. 

